Available in multi-player

This add-on is compatible with the multi-player game mode. The files are being used for the multi-player game mode just like in the single-player part.

Can be un-installed at any time

You can un-install this add-on at any time — deleting/moving the .PK3 file allows you to simply uninstall it. Note that the zipped archive doesn't provide any un-install program — the best way to not pollute the Windows registry. That's why you have to manually un-install deleting the file in question.